20897129174 has 4 divisors (see below), whose sum is σ = 31345693764. Its totient is φ = 10448564586.

The previous prime is 20897129153. The next prime is 20897129191. The reversal of 20897129174 is 47192179802.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5224282292 + ... + 5224282295.

It is an arithmetic number, because the mean of its divisors is an integer number (7836423441).

Almost surely, 2^20897129174 is an apocalyptic number.

20897129174 is a deficient number, since it is larger than the sum of its proper divisors (10448564590).

20897129174 is a wasteful number, since it uses less digits than its factorization.

20897129174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10448564589.

The product of its (nonzero) digits is 508032, while the sum is 50.

The spelling of 20897129174 in words is "twenty billion, eight hundred ninety-seven million, one hundred twenty-nine thousand, one hundred seventy-four".